Detection of the near-infrared counterpart of GRB 971214 3.2 hours after the gamma-ray event

J. Gorosabel; A. J. Castro-Tirado; C. J. Willott; H. Hippelein; J. Greiner; A. Shlyapnikov; S. Guziy; E. Costa; M. Feroci; F. Frontera; L. Nicastro; E. Palazzi

arXiv · astro-ph/9804331

Detection of the near-infrared counterpart of GRB 971214 3.2 hours after the gamma-ray event

J. Gorosabel·A. J. Castro-Tirado·C. J. Willott·H. Hippelein·J. Greiner·A. Shlyapnikov·S. Guziy·E. Costa·M. Feroci·F. Frontera·L. Nicastro·E. Palazzi

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Abstract

We report the detection of the GRB 971214 counterpart in the near-infrared by means of two images in the K'-band taken at Calar Alto only ~3.5 and ~5 hours after the gamma-ray event. We detect the transient at K'=18.03+/-0.18 and K'=18.00+/-0.22 respectively. Our data seem to indicate the existence of a plateau with duration ~1.5 < T < 6.7 hours (between 3.5 and 10.2 hours after the high-energy event). Moreover the power-law decline should be steeper than the one given by the index ak'=0.45. There is also a change in the slope of the broad-band spectrum at some wavelength between the J and K' bands (possibly around the H-band).

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J. Gorosabel, A. J. Castro-Tirado, C. J. Willott, H. Hippelein, J. Greiner, A. Shlyapnikov, S. Guziy, E. Costa, M. Feroci, F. Frontera, L. Nicastro, E. Palazzi. 1998-04-30. Detection of the near-infrared counterpart of GRB 971214 3.2 hours after the gamma-ray event. https://arxiv.org/abs/astro-ph/9804331

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